| 1 | /* scoped_mmap, automatically unmap files |
| 2 | |
| 3 | Copyright (C) 2018-2020 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include "common-defs.h" |
| 21 | #include "scoped_mmap.h" |
| 22 | #include "scoped_fd.h" |
| 23 | #include "gdbsupport/filestuff.h" |
| 24 | |
| 25 | #ifdef HAVE_SYS_MMAN_H |
| 26 | |
| 27 | scoped_mmap |
| 28 | mmap_file (const char *filename) |
| 29 | { |
| 30 | scoped_fd fd (gdb_open_cloexec (filename, O_RDONLY, 0)); |
| 31 | if (fd.get () < 0) |
| 32 | perror_with_name (("open")); |
| 33 | |
| 34 | off_t size = lseek (fd.get (), 0, SEEK_END); |
| 35 | if (size < 0) |
| 36 | perror_with_name (("lseek")); |
| 37 | |
| 38 | /* We can't map an empty file. */ |
| 39 | if (size == 0) |
| 40 | error (_("file to mmap is empty")); |
| 41 | |
| 42 | scoped_mmap mmapped_file (nullptr, size, PROT_READ, MAP_PRIVATE, fd.get (), 0); |
| 43 | if (mmapped_file.get () == MAP_FAILED) |
| 44 | perror_with_name (("mmap")); |
| 45 | |
| 46 | return mmapped_file; |
| 47 | } |
| 48 | |
| 49 | #endif /* HAVE_SYS_MMAN_H */ |